I followed the directions in “ Using FITS Liberator To Create An RGB Image” to create this image. Lastly, this is the result is from processing using FITS Liberator: It took about 30 minutes to get this result, which is the longest out of all of the times it took to process images in the various applications. While this automatic alignment is convenient and produces excellent results, plate solving adds another step to your image processing pipeline. Instead, you have to plate solve your images and then it uses the WCS coordinates automatically to align your images. SAOImage DS9 does not support manual alignment of images. In addition, the image I came up with was not aligned – there were multiple stars where there should have only been one star. I adjusted the scale of each of the R, GĪnd B channels to bring out the detail and ended up with the image you see When following those directions, I ended up with a very I followed the directions in “ Creating An RGB Image Using SAOImage DS9” to create this image. The next result we have is from SAOImage DS9: It tookĪbout 15 minutes to get this result – I had to align images and adjust blending The background is dark, and there is good tonal variation in the image. The result is very good – there’s good detail in the nebula, I followed the directions in Using ’s JS9 FITS Editor To Create RGB Images to create this image. It took about 5 minutes to produce this result, so I’m getting a reasonable result in a short span of time. There’s some detail in the nebula and the overall color is pretty good (the background could be darker). I loosely followed the directions in Processing An Image Using MaxIM DL and Photoshop to create this image. The nebula is a little over-exposed but I suppose that could be adjusted with some work, It took me about 25 minutes to create this image. ![]() This image has very little noise and the colors of the nebula are easily visible. I processed the same FITS files using JS9, FITS Liberator, I took an observation of NGC 2440 and exposed 200 secondsĮach of LRGB and processed the images to produce a set of results for Quality of the observation, and the quality of the image itself. The answer is, it depends on the image: the subject, the SAOImage DS9? What about MaxIM DL? How do I know which application is best to Is best? Does JS9 do better with some images as compared to FITS Liberator or The questions I’m often asked are, which processing application Quite probably there is a more elegant solution, but this works.I have written extensively about using image processingĪpplications like JS9, Fits Liberator, SAOImage DS9, and MaxIM DL. Use you favourite editor to attach these lists to each other. This will then give you a list of the RA, Dec of the same sources. If you want to match this up with the 2MASS sources then you have to "list regions" again, but this time select "fk5" as the coordinate system. This will give you a list of x,y coordinates. ![]() From this, select "x,y" for the format and "image" for the coordinate system. Another dialogue box will open asking you to select the format and coordinate system. ![]() Then, in the main image window open the "Regions" dialogue and select "List regions". From the "File" dialogue, select "Copy to regions". When you load the catalog you should see a window open entitled "2MASS Point sources" which lists all the sources in your image. Is what you are asking - how do I get the x,y coordinates of these 2MASS sources in my image? Or do you wish to know what the x,y coordinates of the actual sources in your image? If the latter then you will need some other software like Sextractor or DAOphot to do source-searching and parameterisation in your image. When you load the 2MASS catalogue, SAOimage is able to use the RA and Dec in the catalogue to calculate the x,y positions of the catalog sources in your image (and marks them as green circles). OK, it seems to me that what you have is a fits image (from where?) that has some world coordinate system information attached.
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